I read the guide Distributing to Specific Screens and i tried both

<compatible-screens
   android:smallScreens="false"
   android:normalScreens="false" 
   android:largeScreens="true"
   android:xlargeScreens="true"/> 

and

<supports-screens
   android:smallScreens="false"
   android:normalScreens="false" 
   android:largeScreens="true"
   android:xlargeScreens="true"/>

even combined (iknow... i know... :D)

But i can't seem to be able to limit my app from showing up in searches from my tablet (and of course it also installs)

The reverse setting works though..

<supports-screens
   android:smallScreens="false"
   android:normalScreens="false" 
   android:largeScreens="true"
   android:xlargeScreens="true"/>

my phone appears incompatible with the tablet version of the APK. What gives? is there something i'm not getting in the way that Google play filters using the Manifest?